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Old January 22nd 08, 08:17 PM posted to rec.radio.amateur.antenna
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Standing-Wave Current vs Traveling-Wave Current

Jim Kelley wrote:
You claim there's power in the canceled waves.


That is a false statement and you are either totally
confused or bearing your usual false witness.
I have never claimed that there is power in the
canceled waves *after* they cancel, only that there
was energy in them *before* cancellation took place.
The HP ApNote 95-1 on s-parameters agrees with me.

b1 = s11*a1 + s12*a2 now square both sides

|b1|^2 is the reflected power
|s11|^2 is the power reflection coefficient
|a1|^2 is the forward power
|s12|^2 is the power transmission coefficient
|a2|^2 is the reflected power

It's obvious that you don't understand the HP
ApNote.

There's zero energy in the total superposed wave
after cancellation. There was energy in the two
waves before they were superposed. That energy
cannot be destroyed no matter how loudly you complain.
It is more than apparent that you detest the conservation
of energy principle because it works against your
argument. But as they say in Russia, tough ****sky.

When two waves are canceled, their energy components
are redistributed to another area. In a transmission
line, with only two directions possible, their energy
components are redistributed in the other direction
from their original direction of flow. What is it about
the Melles Groit and FSU web pages that you don't
understand and what is it about the following that you
don't understand?

"The waves' energies simply add together. In places where
the interference is destructive, one wave cancels out the
other. (up + down = nothing.) Where it is constructive,
however, they reinforce each other
(up + up = 2 * up, down + down = 2 * down.)
That is all there is to it."

Richard E. Barrans Jr., Ph.D.
Assistant Director
PG Research Foundation, Darien, Illinois

P3 + P4 - 2*SQRT(P3*P4) = 0 = nothing
P1 + P2 + 2*SQRT(P1*P2) = 2P1 + 2P2
That is all there is to it.
--
73, Cecil http://www.w5dxp.com
 
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